Interface IntegrationTests

Tag a test as 'integration/system' test, meaning that the test class has the following
characteristics:

Possibly takes hours to complete

Can be run on a mini cluster or an actual cluster

Can make changes to the given cluster (starting stopping daemons, etc)

Should not be run in parallel of other integration tests

Integration / System tests should have a class name starting with "IntegrationTest", and
should be annotated with @Category(IntegrationTests.class). Integration tests can be run
using the IntegrationTestsDriver class or from mvn verify.